What is a good way to use Bevy in a tabbed window? (Multiple instances of Bevy)

[tgross35]

I'm trying to use Bevy to make a CAD file viewer, which means figuring out some way to use a tabbed/paned interface with Bevy rendering the contents of a tab. I think I may use egui since it seems to have good integration with Bevy, and specifically egui_dock. But what would be the best way to handle rendering within each pane? I'm wondering about things like:

• Should there be a single Bevy instance or (somehow) one per pane
• How do I make sure that background panes are not using extra resources
• How can I deduplicate resource usage as much as possible among the panes

It seems like perhaps the best solution is to have one Bevy instance with one camera per pane, then somehow make each camera only render entities specific to that view, and don't render any cameras not in the current view. But this seems to have the downside of keeping the resources for all panes always loaded, without a straightforward way to unload inactive tabs.

So, does anyone have any advice for how to go about doing this?

Side question - is there a way to get infinite repeating sprites for cheap? Such as grid lines that